I up voted your answer. I also wrote out a long form version of an answer, using a different source. Since it was current MLA, it provided similar content to the excellent URL you provided.
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Ellie KesselmanDec 27 '11 at 23:22

I paraphrased this from Robert Harris' MLA In-Text Citation Style, November 2010. It is based on the Seventh Edition of MLA for Research Writers, 2009, which remains the most current version. Harris distinguishes between a web page and a database. Here is the standard for a web page, or web address, as the question requested.